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home sequence
« on: March 10, 2012, 10:19:07 AM »
Hello All

Mack turn on a lathe

When I do g28 for the machine to "go to home"
the first movement is on the z axis and this causes a crash into the rear tool holder
How can i code for a home (g28) to home the z axis first
it need to go z home before x home

regards

fred evans
think of the trees-- use both sides of the computer paper

Offline RICH

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Re: home sequence
« Reply #1 on: March 11, 2012, 05:53:58 AM »
Have a read of the Lathe manual page 10-13.
G28 Zx.x
G28 Zx.x Xx.x
G28 .1 searches for the home switches.

RICH
Re: home sequence
« Reply #2 on: March 11, 2012, 07:51:14 AM »
Thanks rich - will do
think of the trees-- use both sides of the computer paper
Re: home sequence
« Reply #3 on: March 11, 2012, 09:14:52 AM »
Hello Rich

When You say "the lathe manual " do you mean
"Using Mach3 Turn" If so mine finishes on section 10.12

regards

fred

think of the trees-- use both sides of the computer paper

Offline RICH

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Re: home sequence
« Reply #4 on: March 11, 2012, 10:07:24 AM »
Yes. Download it again since  since it goes goes beyond 10-12 to section 15.
RICH
Re: home sequence
« Reply #5 on: March 11, 2012, 10:23:18 AM »
Hi Guys,
 It's actually Chapter 10.7.8  & 10.7.9 in the index. Page is 10-13.
G28 doesnt work as described for me. I don't think it ever did.
Russ

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Re: home sequence
« Reply #6 on: March 11, 2012, 10:32:35 AM »
Russ,
G28 and it should go home?
G28 X0.0 and it will home the x
G28 Z0.0 and it will home the z
G28 X0.0 Z0.0 and it will home both in a combination move
G28 X?.? Z?.? and it will home via the intermittant point defined

How's it suppose to work?
RICh

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Re: home sequence
« Reply #7 on: March 11, 2012, 10:40:38 AM »
Russ,
let me re-phase.....how was it described to you?
RICH
Re: home sequence
« Reply #8 on: March 11, 2012, 10:42:59 AM »
Hi RICH,
 My assumption according to attached:

If my HOME pos is Z0,X0 and I am currently at X2,Z-2 and want the tool to go to Z-1 before going home, program G28 Z-1 and there should be 2 moves.
Z will go to -1 THEN both axis will (should) go to HOME. I only get the first move.

G28.1 will (should) actually run the HOMING sequence for the specified axis.

Russ

Offline RICH

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Re: home sequence
« Reply #9 on: March 11, 2012, 10:53:12 AM »
Ahh...ok now i know what you mean. One can read to the exact letter though and as it's stated you would need both an
X & Z location. Not sure how other controllers work and will do a quick look at the Smid book to see what he say's even though it may not be relavant.
Don't remember if it works the same in mill.....

RICH